Affiliation:
1. Department of Dermatology Academisch Medisch Centrum, University of Amsterdam, Amsterdam, The Netherlands
Abstract
SUMMARY
Purified peripheral blood human T lymphocytes, derived from normal individuals, were assayed for their susceptibility to low doses of ultraviolet B (UVB) In vitro. Exposure of T cells to graded single doses (range 0–8 mJ/cm2) of UVB resulted in a dose-dependent reduction of viability. This phototoxic effect was not immediately apparent, however, but became manifest 48–72 h subsequent to irradiation. A dose as little as 0·5–1 mJ/cm2 was sufficient to cause 50% mortality. Irradiated T cells showed a reduced ability to proliferate, irrespective of the stimulus used, and a reduced ability to produce cytokines IL-2, IL-4, IL-5, interferon-gamma (IFN-γ) and tumour necrosis factor-alpha (TNF-α). This decreased ability was UVB-dose related and, remarkably, was exactly correlated to phototoxicity. UVB had no effect on CD4 and CD8 expression or their ratio, whereas the expression of IL-2R (CD25) was only slightly reduced. Our data suggest that UVB radiation neither selectively affects Th1 or Th2 nor CD4 or CD8 T cell subsets. The high susceptibility of T cells to UVB might explain, al least in part, the beneficial effect of phototherapy during treatment of certain immunodermatological diseases.
Publisher
Oxford University Press (OUP)
Subject
Immunology,Immunology and Allergy
Cited by
21 articles.
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